True: 10+14 = 24, 29+30 = 59, 23+30 = 53, 57+10 = 67, 85-10 = 75, 63-20 = 43, 91-30 = 61, 20+45=65, 56-30=26, 98-10=88, 23=20=43, 67-40=27, 44+30=74, 97-20=77, 101-10=91, False: 40+23 = 33, 30+24 = 64, 74+20 = 104, 14-10 = 7, 58-30 = 88, 22-20 = 12, 9+30 = 49, 17+20=27, 99-10=79, 100-40=50, 56+20=85, 13+30=33, 28+60=68, 86-10=66, 66+20=76,

Adding and Subtracting multiples of 10

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